A computer mouse is a small, hand-held device that serves as an input and pointing device.
When you move it (and hence the cursor on the screen), the computer moves its pointer to point to things too. You often also use this for so-called “two-button clicks” – first releasing one mouse button down and then pressing another to click or double-click things).
Humans and other animals typically need only one thumb and three fingers to control a computer mouse. For example, people with but one hand can usually still use two buttons on the left side of their keyboard as arrows for scrolling through text or images on your screen, just like those with two hands would do if they held a traditional right-handed